I am very, very impressed with what you're doing and how well you're doing it!
Since you're looking for ideas, and given the photos you've posted, I wonder whether you've done any sort of baked potato casserole, with cheese, cream, even maybe an appropriate meat? Here's where I got the idea for something I wanted to try duplicating sometime, and this recipe looked like a good starting point for my attempts at duplication. (I still haven't gotten to it.)
What about macaroni and cheese, with ham if you can find it? Tuna and noodle casserole?
My best friend and her husband have cooked on occasion for a homeless shelter in their area. One she remembers is called "Dump and Bake Chicken Alfredo". They literally dumped all the ingredients into the pan, baked and served. She remembers chunks of raw chicken, pasta, milk, and either cream of chicken or cream of mushroom soup. (She's looking right now for the recipe to see what the cooking time and temperature is, but not finding it.) There is a meatball and marinara sauce version that starts with cooked meatballs. She says that when they've made that dish they've assembled it, baked and been ready to serve all within an hour.
Edited to add: she hasn't found the chicken recipe, but she sent me a meatball and rice recipe. I've attached a PDF of it.
